Alternative Title

Paper No. 1.40

Location

St. Louis, Missouri

Session Start Date

3-8-1998

Session End Date

3-15-1998

Abstract

Three 30,000m3 storage tanks are located at a hydraulic-filled reclamation site and close to an earthquake active area in Taiwan. In order to reduce the risk of liquefaction in loose silty sand of foundations, the soil improvement methods of both dynamic compaction and vibro-replacement stone column are applied. One storage tank foundation was improved using vibro-replacement stone column approach only, and the treatment pattern consisted of stone columns on a triangular grid arrangement with three spacing patterns. A combination of the dynamic compaction and vibro-replacemenr stone column technique was utilized on foundations of the others. The dynamic compaction was performed at two different storage tank foundations with two types of impact energy first, then vibro-replacement stone column technique was carried out. To understand the effect of time on soil strength after soil improvement, CPT soundings were frequently performed at short interval time. It was found from results of CPT that soil strength increased with decreasing spacing of stone columns and increasing dynamic compaction impact energy. But during the short period of time after improvement, soil strength has no obvious change with time.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-8-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 8th, 12:00 AM Mar 15th, 12:00 AM

Soil Improvement for Storage Tank Foundations

St. Louis, Missouri

Three 30,000m3 storage tanks are located at a hydraulic-filled reclamation site and close to an earthquake active area in Taiwan. In order to reduce the risk of liquefaction in loose silty sand of foundations, the soil improvement methods of both dynamic compaction and vibro-replacement stone column are applied. One storage tank foundation was improved using vibro-replacement stone column approach only, and the treatment pattern consisted of stone columns on a triangular grid arrangement with three spacing patterns. A combination of the dynamic compaction and vibro-replacemenr stone column technique was utilized on foundations of the others. The dynamic compaction was performed at two different storage tank foundations with two types of impact energy first, then vibro-replacement stone column technique was carried out. To understand the effect of time on soil strength after soil improvement, CPT soundings were frequently performed at short interval time. It was found from results of CPT that soil strength increased with decreasing spacing of stone columns and increasing dynamic compaction impact energy. But during the short period of time after improvement, soil strength has no obvious change with time.